Числа второго десятка.

11 11 = 10 + 1             11 = 1 + 10 11 = 9 + 2               11 = 2 + 9 11 = 8 + 3               11 = 3 + 8 11 = 7 + 4               11 = 4 + 7 11 = 6 + 5               11 = 5 + 6	12 12 = 10 + 2               12 = 2 + 10 12 = 9 + 3                 12 = 3 + 9 12 = 8 + 4                 12 = 4 + 8 12 = 7 + 5                 12 = 5 + 7 12 = 6 + 6
13 13 = 10 + 3             13 = 3 + 10 13 = 9 + 4               13 = 4 + 9 13 = 8 + 5               13 = 5 + 8 13 = 7 + 6               13 = 6 + 7	14 14 = 10 + 4               14 = 4 + 10 14 = 9 + 5                 14 = 5 + 9 14 = 8 + 6                 14 = 6 + 8 14 = 7 + 7
15 15 = 10 + 5             15 = 5 + 10 15 = 9 + 6               15 = 6 + 9 15 = 8 + 7               15 = 7 + 8	16 16 = 10 + 6               16 = 6 + 10 16 = 9 +7                  16 = 7 + 9 16 = 8 + 8
17 17 = 10 + 7            17 = 7 + 10 17 = 9 + 8               17 = 8 + 9	18 18 = 10 + 8               18 = 8 + 10 18 = 9 + 9
19 19 = 10 + 9             19 = 9 + 10	20 20 = 10 + 10